Date.prototype.format = function (fmt) { //author: meizz   
    var o = {
        "M+": this.getMonth() + 1,                 //月份   
        "d+": this.getDate(),                    //日   
        "h+": this.getHours(),                   //小时   
        "m+": this.getMinutes(),                 //分   
        "s+": this.getSeconds(),                 //秒   
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度   
        "S": this.getMilliseconds()             //毫秒   
    };
    if (/(y+)/.test(fmt))
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt))
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
}

const {parentPort} = require('worker_threads')
let sum = 0
let start = new Date().format('yyyy-MM-dd hh:mm:ss');
for (let i = 0; i < 1000000000; i++) {
    sum += i;
}
let end = new Date().format('yyyy-MM-dd hh:mm:ss');
console.log('child===','start:',start,'end:',end)
//发送信息
// parentPort.postMessage(sum);
process.send(sum);
